001/* ===================================================
002 * JFreeSVG : an SVG library for the Java(tm) platform
003 * ===================================================
004 * 
005 * (C)opyright 2013, 2014, by Object Refinery Limited.  All rights reserved.
006 *
007 * Project Info:  http://www.jfree.org/jfreesvg/index.html
008 * 
009 * This program is free software: you can redistribute it and/or modify
010 * it under the terms of the GNU General Public License as published by
011 * the Free Software Foundation, either version 3 of the License, or
012 * (at your option) any later version.
013 *
014 * This program is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017 * GNU General Public License for more details.
018 *
019 * You should have received a copy of the GNU General Public License
020 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
021 * 
022 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
023 * Other names may be trademarks of their respective owners.]
024 * 
025 * If you do not wish to be bound by the terms of the GPL, an alternative
026 * commercial license can be purchased.  For details, please see visit the
027 * JFreeSVG home page:
028 * 
029 * http://www.jfree.org/jfreesvg
030 * 
031 */
032
033package org.jfree.graphics2d.canvas;
034
035import java.io.BufferedWriter;
036import java.io.File;
037import java.io.FileWriter;
038import java.io.IOException;
039import java.util.logging.Level;
040import java.util.logging.Logger;
041
042/**
043 * Utility methods related to the {@link CanvasGraphics2D} implementation.
044 */
045public class CanvasUtils {
046    
047    private CanvasUtils() {
048        // no need to instantiate
049    }
050    
051    /**
052     * Writes HTML output containing a script (usually generated by 
053     * {@link CanvasGraphics2D}) to the specified file.  This method is used 
054     * in the demo applications.
055     * 
056     * @param f  the file.
057     * @param title  the title for the HTML.
058     * @param canvasID  the canvas ID.
059     * @param width  the canvas width.
060     * @param height  the canvas height.
061     * @param canvasScript  the canvas script.
062     * 
063     * @throws IOException if there is an IO error.
064     */
065    public static void writeToHTML(File f, String title, String canvasID,
066            int width, int height, String canvasScript) throws IOException {
067        BufferedWriter writer = null;
068        try {
069            writer = new BufferedWriter(new FileWriter(f));
070            writer.write("<!DOCTYPE html>\n");
071            writer.write("<html>\n");
072            writer.write("<head>\n");
073            writer.write("<title>" +title + "</title>\n");
074            writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n"); 
075            writer.write("<script>\n");
076            writer.write("window.onload = function() {\n");
077            writer.write("var canvas = document.getElementById(\"" + canvasID 
078                    + "\");\n");
079            writer.write("var ctx = canvas.getContext(\"2d\");\n");
080            writer.write("if (!ctx.setLineDash) {\n");
081            writer.write("ctx.setLineDash = function() {};\n");
082            writer.write("}\n");
083            writer.write(canvasScript + "\n");
084            writer.write("}\n");
085            writer.write("</script>\n");
086            writer.write("</head>\n");
087            writer.write("<body>\n");
088
089            writer.write("<canvas id=\"" + canvasID + "\" width=\"" + width 
090                    + "\" height=\"" + height + "\"></canvas>");
091            writer.write("</body>\n");
092            writer.write("</html>\n");
093            writer.flush();
094        } finally {
095            try {
096                if (writer != null) {
097                    writer.close();
098                }
099            } catch (IOException ex) {
100                Logger.getLogger(CanvasUtils.class.getName()).log(Level.SEVERE, 
101                        null, ex);
102            }
103        } 
104    }
105    
106}